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你的答案是两个开关都可以开或关, 不是其中一个只能开, 另外一个只能关... 不符合答案要求!!!
expertune
(专家 GUID)
(#332261@0)
Last Updated: 2002-1-12
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电子工程师请注意了，请教一个初级问题。
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